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(NoModeL) Q W. E. McINTOSH.

'BURGLAR ALARM. No. 380,912. PatentedApr. 10,1888.

UNrrED STATES PATENT Orrrea.

\VILLIAM E. MOINT OSH, OF KEENE, NEWV HAMPSHIRE, ASSIGNOR OF ONE- I-IALF TO FRANK H. WYMAN, OF SAME PLACE.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 380.912, dated April 10, 18818.

(No model.)

To all whom, it may concern.-

Be it known that I, WILLIAM E. McINTosH, acitizen of theUnited States, residing at Keene, in the county of Cheshire and State of New Hampshire, have invented certain new and useful Improvements in Burglar-Alarms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates toburglar-alarmsf and it consists in an improved device for an alarm attachment for doors and windows, as hereinafter described and claimed.

In the accompanying drawings, Figure 1 represents a side elevation of the device applied to a window. Fig. 2 is a side elevation, the alarnrloell and part of the mechanism being removed. Fig. 3 is an edge view. Fig. 4 is a'section taken on linear 9c of Fig. 2.

A designates the body or frame of the alarm attachment, which may be made of wood or other suitable material and provided with facing-plates a, secured to the sides by screws. In the upper part of the body A is formed a recess or chamber, B, the bottom or floor of which is made curving or concave,being lowest at the center, for the purpose hereinafter mentioned. To the lower part of the body is secured the alarm mechanism, somewhat similar to that in a clock-movement, being supported by the plates 1) I), connected by pillars 0, and having supports cl secured to the body.

0 indicates the winding-shaft having bearings in the plates 1) b at their centers and provided. with a handle-knob, e, said shaft having mounted thereon the actuating-springf, and being connected by a train with an escape-wheel, g, which engages with apallet, g, on a shaft, 7a, which also carries a hammer, h.

The alarm-bell D is placed on the windingshaft, which passes through it at the center, the bell covering the mechanism and being in position to be struck by the hammer h, which is provided with a pin, '5, which extends laterally therefrom through a slot, m, in the plate I). The pin t isintended to engage with the free end of a spring, a, which is secured at one end and extends along and over a groove, 0, in and across the floor of chamber B at the center of the floor. The free end of spring a is turned downward, so it nearly reaches the path of pint during the move ment of the hammer, and when the said spring is pressed down into the groove 0, as hereinafter stated, it serves as a stop or detent for the hammer by contact with the pin t, against which it catches, and thus prevents operation of the driving mechanism.

E indicates a roller, which is placed loose in the chamber B, so that it may move automatically on the floor of the chamber when the body of the device is inclined edgewise in either direction.

When the device is attached in a vertical 6 position to a door-knob, the roller E rests on the floor of chamber B at the center, pressing down the spring a, so that it engages wit-h pin i, detaining the hammer, and when by any movement of the knob of the door the bodyA is inclined in either direction the roller E rolls automatically from the center of the floor and away from the spring a, which immediately rises sufficiently to release the hammer, and the actuating-spring, having been previously 75 wound by means of the handle-knob e, immediately sets the hammer in motion through the gearing and pallet above mentioned, the pin 2 moving in slot at and the hammer repeatedly striking the bell and producing a continuous alarm.

The device is provided atits upper end with a screw-clamp, F, by which it may be readily attached to or detached from a door-knob, the book of the clamp being placed on the neck of 85 the knob and secured thereon by the screw, as seen in Fig. 2. XVhen the device is thus tightly secured in a vertical position, if the door-knob is turnedin either direction, the attachment is inclined and an alarm. immediately sounded.

An attaching device is also provided for applying the attachment to windows.

G designates a gripping-arm, which is usu ally formed of wire and coupled at one end to the body A and extends laterally therefrom, as shown, having gripping'jawsp formed at its outer end, said jaws being closed by means of a sliding keeper, r, which maybe moved outward or inward. The arm is coupled to I00 the body by means of a bolt, 8, having ahead, 8, and a nut, to, by means of which the coupling may be tightened and the gripping-arm firmly held in relative position at a right angle with the body. When the arm G is not in use, it may be closed like the blade of a knife, sinking in a recess, a, in the body A.

WVhen it is desired to apply the alarm attachment to a window, the nut to is loosened, the arm raised to the position shown in Fig. 1, and the nut again tightened and the jaws 19 applied to a muntin of the upper sash and closed against it by moving the keeper r. The arm G has a bearingpoint, t, which rests on the top of the lower sash, the alarm attachment being held in a vertical position, as shown, anda movement of either the upper or lower sash causes the body A to incline and an alarm is sounded.

A small clamp is provided for attaching the device to the handle of an ordinary doorlateh, the clamp consisting ofa bolt, 1), provided with a rectangular hook, 1;, and a nut, w, by which the hook may be tightened against the body or loosened, so that the latch-handle may be tightly clamped under the hook of the bolt and the device held in vertical position.

The alarm attachment described is compact and simple in construction, and, being small, 7

is conveniently portable. It is Very prompt in operation, a very slight inclination only of the device from the vertical position being necessary to move the inclosed roller and release the striking-hammer, when an alarm is immediately sounded;

I claim 1. In burglar-alarms, the combination, with the hammer h, having the pin 2', of the plate I), having the arc slot m, the pallet g on the same shaft as the hammer, the escapementwheel and spring clock mechanism, substantially as described.

2. In burglar-alarms, the combination of the chamber B, downwardly inclined toward the middle and there provided with the groove 0, the roller E,arranged1oose1yin said chamber, the spring at, extending over said groove, and the hammer h, having a pin to engage with said spring, whereby said hammer may be held or released, as described.

In testimony whereof I have affixed my signature in presence of two witnesses WILLIAM E. MOINTOSH.

Witnesses:

H. S. MARTIN,

FRANK H. WYMAN. 

